add all the watts together and divide by the voltage. (ya wanna be correct then multiply by 1.25) that will give your amperage at full load. If the nameplate states the amperage, just add it up.
None of that stuff usually adds up to much, but all of it should have a UL tag. We could get into a lot of possibilities here, but that's the basic. The 1.25 is because all the 'stuff' you mentioned is solid state, so off the top of your head you have to figure for an 80% power factor.
